Propagation equations support top cement pulsation technique

A new cementing technology, top cement pulsation, can delay the static pressure loss of the slurry and effectively prevent gas migration under complex geologic conditions.1 2When designing a cement job, cement quality is directly related to the chemical and physical properties of the slurry, thickening time, water loss, and formation permeability. Thus, under normal geologic conditions, simple additives such as retarders, accelerators, friction reducers, filtration-control additives, and lost-control material can generally be added to improve overall cement quality.Under complex geologic conditions, however, severe oil and gas migration phenomena can occur while cementing, in some cases l...

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